<div class="example-wrapper">
    <div style="margin-bottom: 5px">
        <button onClick="onBtExpandAll()">Expand All</button>
        &nbsp;&nbsp;&nbsp;
        <button onClick="onBtCollapseAll()">Collapse All</button>
        &nbsp;&nbsp;&nbsp;
        <button onClick="onBtExpandTopLevel()">Expand Top Level Only</button>
    </div>
    <div id="myGrid"></div>
</div>
